I think an effort to provide for the newcomers of the future holds greater value. Gaining new members to the platform can be done easily, having the ability to provide for them and retain them is what needs to be looked at a bit closer and the methods to develop.
The value to a reward will reduce over time with more teem powered up. There is a limited amount produced daily which is divided between the powered Stake. Where 1000 Steem now might reward 0.02 cents. That amount goes down as more is powered up on other account's. Retaining new members is key to being able to provide a reward on a rewarding platform. Alternative methods to increase the reward pool need to be considered.
Just a thought.